CN104033348A - Digital quantitative continuous liquid injection pump - Google Patents
Digital quantitative continuous liquid injection pump Download PDFInfo
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- CN104033348A CN104033348A CN201410253697.3A CN201410253697A CN104033348A CN 104033348 A CN104033348 A CN 104033348A CN 201410253697 A CN201410253697 A CN 201410253697A CN 104033348 A CN104033348 A CN 104033348A
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Abstract
The invention relates to a digital quantitative continuous liquid injection pump. The digital quantitative continuous liquid injection pump comprises a power source, a transmission system, an actuating mechanism and a control system, wherein the power source is used for outputting a rotary motion; the transmission system is used for changing the speed of the rotary motion output by the power source, then converting into a linear motion, then driving the actuating mechanism to suck liquid inside a container into a device and then draining the liquid at a liquid outlet; the control system is used for controlling the whole device, stepless speed change is realized by controlling impulse frequency, quantitative liquid injection is realized by controlling impulse quantity, the liquid injection precision is improved by introducing flow rate feedback, and overload protection is realized by introducing a pressure switch. The flow velocity of a fluid is controlled by adjusting the rotating speed of a stepper motor, so that the working pressure of the system is above the air separation pressure and saturated vapor pressure of the liquid, cavitation is prevented, and the work stability of the system is greatly improved, and the service life of the device is prolonged.
Description
Technical field:
The present invention relates to a kind of machinery---electronics---hydraulic control means of utilizing and realize technology continuous, quantitative liquid-filling, belong to fluid injection, sample introduction, cleaning instrument field.
Background technique:
In fields such as chemical industry, mining, metallurgy, papermaking, food, medical apparatus, oil, water treatment, pharmacy, often need to use the solution transferring apparatus such as fluid injection, sample introduction, cleaning.This quasi-instrument, in the process of work, often all can produce cavitation.
Cavitation may be interpreted as: inner at flowing liquid, if the pressure range of fluid is large, bubble can be separated out in the low pressure area of fluid, then compressed in zone of high pressure, while being compressed to a certain degree, bubble can break, generation is up to the instantaneous high pressure of 150MPA-200MPA, instantaneous pressure can be propagated to surrounding with the form of pressure wave, makes hydraulic system produce vibration and noise, destroys hydraulic element.As can be seen here, as avoided fluid to produce cavitation, just must control the pressure in flow of fluid process.Liquid, in flow process, exists kinetic energy, gravitational potential energy, three kinds of energy of pressure potential.If equal altitudes flows, gravitational potential energy does not just change, again according to total energy conservation law, the kinetic energy of fluid and the summation of pressure potential just do not change, the kinetic energy and the pressure potential that is to say fluid are to be this those long inverse relationships that disappear, the kinetic energy of fluid is larger, and pressure potential is just less; The kinetic energy of fluid is less, and pressure potential is just larger.That is to say, the flowing velocity of fluid is faster, and pressure is less; Flowing velocity is slower, and pressure is larger.Therefore the pressure of flow process is controlled and can be realized by controlling the flowing velocity of fluid.
Except preventing cavitation, can the height that complete long-time continuous fluid injection and fluid injection precision be also two important indicators evaluating a fluid injection or sample introduction instrument performance.At present, more existing same devices on market, as digital syringe pump and peristaltic pump.Although digital injection pump fluid injection precision is high, can only complete continuous fluid injection of short time, as wanted long-time fluid injection, just fluid injection several times, cumulative error can be very large, and fluid injection precision is very low, and digital injection pump can only be for injection.Although peristaltic pump can complete long-time continuous fluid injection, the flow velocity of peristaltic pump is slow, and efficiency is low, is not permanent flow pump.
Summary of the invention:
The present invention aims to provide a kind of device that can realize stepless change, quantitative, continuous fluid injection, by controlling the flowing velocity of fluid, the air separation of the working pressure that makes system in liquid press and saturation vapour pressure on, prevent cavitation, improve the stability of system works and the working life of device.
The continuous topping-up pump of digital quantitative, comprise power source, transmission system, actuator, control system, described power source output rotatablely moves, transmission system is carried out speed change to rotatablely moving of power source output, then be converted into straight line motion, and then drive actuator by the liquid suction device in container, at liquid outlet, discharge again, control system is used for controlling whole device, by control impuls frequency, realize stepless change, by control impuls quantity, realize quantitative liquid-filling, by introducing flow feedback, improve fluid injection precision, by introducing pressure switch, realize overload protection.
Further, described power source is stepper motor.
Further, described transmission system is deceleration system, comprises two deceleration gear transmissions, and the velocity ratio of second level gear pair is greater than the velocity ratio of first order gear pair.
Further, on the afterbody transmission shaft of described transmission system, at least two cams are installed, 180 ° of the phase phase differences of two cams.
Further, two flywheels are installed on the afterbody transmission shaft of described transmission system, flywheel is arranged on the two ends of transmission shaft, makes system operation more steady, vibrates less.
Further, described actuator comprises two plunger pumps, and plunger pump is connected in parallel, plunger pump on pipeline, all have one-way valve, spring is installed in plunger pump, and plunger is provided with roller on termination, and roller is close on the cam of driving mechanism under spring action.
Further, described control system comprises flowmeter, pressure gauge, computer, pulse signal generator, ring distributor, analog line driver, flowmeter and pressure gauge are arranged on the fluid pipeline of actuator and are connected with computer, computer is connected with ring distributor, analog line driver by pulse signal generator, control system is used for controlling whole device, by control impuls frequency, realize stepless change, by control impuls quantity, realize quantitative liquid-filling, by introducing flow feedback, improve fluid injection precision.
Further, control software is installed on described computer, can carries out flow velocity setting, output liquid total amount is set, and safe-working pressure is set.
Further, described flow is counted instantaneous flowmeter, and described pulse signal generator is for generation of the pulse signal string of changeable frequency, and described analog line driver adopts unipolarity analog line driver, flowmeter is used for the online instantaneous flow that detects liquid outlet place, then data on flows is passed to computer.
Further, described ring distributor is for distributing to pulse signal string each phase input end of the analog line driver of stepper motor by the desired rule of stepper motor.
Described pressure gauge is for the online fluid pressure that detects outlet port.
Further, on the fluid pipeline of described actuator, pressure switch is installed, when the pressure at liquid outlet place lower than or during higher than setting pressure, the power supply that pressure switch can automatic cut-off motor, stops operating motor.
Described analog line driver is connected with each winding of stepper motor, and it can carry out power amplification by the output signal of ring distributor, obtain stepping and control the required impulsive current of winding and required pulse shape, then drive motor rotates.
This device is exactly by regulating the rotating speed of stepper motor to control the flowing velocity of fluid, the air separation of the working pressure that makes system in liquid press and saturation vapour pressure on, prevent cavitation, improved widely the stability of system works and the working life of device.
It is that the cam of 180 ゜ is realized the continuous fluid injection of double pulsing that this device differs by two, and the fluid injection time is unrestricted; At liquid outlet place, flowmeter is set again, introduces flow feedback loop, for compensating the error of transmission system, fluid injection precision is very high.This device is also controlled the angle of electric machine rotation by control impuls quantity, and then controls the total amount of output liquid, has quantitative output capability.
The present invention has the following advantages:
1. the present invention can realize the continuous fluid injection of no time limit.
2. the present invention can realize the electrodeless variable-speed of motor, and the flow velocity of liquid outlet place liquid is adjustable.
3. the present invention can detect the pressure at liquid outlet place online, reduces operator and produces because misoperation causes system the probability that cavitation destroys components and parts.
4. the present invention can not add foam depressant just can prevent cavitation in solution, can avoid foam depressant foul solution.
5. the present invention, by introducing output flow feedback element, can realize quantitative liquid-filling, and fluid injection precision is high, reservoir quantity can be set.
6. Design of Transmission System of the present invention adopts minimum angular errors principle and minimum equivalent rotary inertia principle, and transmission accuracy is higher, and system operation is more steady, brisk.
7. the present invention uses flywheel, and the dynamic balance of system is better, vibrates littlely, and noise is lower.
8. wide application of the present invention, is applicable to most noncorrosive liquid.
Accompanying drawing explanation:
Fig. 1 is structural representation of the present invention.
Fig. 2 is the relative position schematic diagram of two cams.
Fig. 3 is plunger 15 and the characteristics of motion figure of plunger 16 within a cycle of motion.
Fig. 4 is the interface of controlling software.
In figure: 1-stepper motor, 2-axle, 3-gear, 4-axle, 5-gear, 6-gear, 7-axle, 8-gear, 9-cam, 10-cam, 11-flywheel, 12-flywheel, 13-roller, 14-roller, 15-plunger, 16-plunger, 17-spring, 18-spring, 19-plunger pump, 20-plunger pump, 21-seal ring, 22-seal ring, 23-one-way valve, 24 one-way valves, 25-one-way valve, 26-one-way valve, the manual shut-off valve of 27-, 28-container, 29-flowmeter, 30-pressure gauge, 31-pressure switch, 32-computer, 33-pulse signal generator, 34 ring distributors, 35-analog line driver, 36-power source, 37-transmission system, 38-actuator, 39-control system.
Embodiment:
Below in conjunction with accompanying drawing, the present invention is described in further detail.
As shown in Figure 1, the continuous topping-up pump of digital quantitative, comprise power source 36, transmission system 37, actuator 38, control system 39, described power source 36 outputs rotatablely move, speed change is carried out in rotatablely moving of 37 pairs of power source outputs of transmission system, then be converted into straight line motion, and then drive actuator 38 by the liquid suction device in container 28, at liquid outlet, discharge again, control system 39 is for controlling whole device, by control impuls frequency, realize stepless change, by control impuls quantity, realize quantitative liquid-filling, by introducing flow feedback, improve fluid injection precision, by introducing pressure switch, realize overload protection.
Further, described power source 36 is stepper motor 1, and it is 1.2 ゜ that motor 1 adopts step angle, and holding torque is 15N.M, and rotor inertia is 20000g.cm
2, the three-phase stepper motor that stepping accuracy is 5%, axle 2 is output shafts of stepper motor.
Further, described transmission system 37 is deceleration system, comprises two deceleration gear transmissions, and the velocity ratio of second level gear pair 6,8 is greater than the velocity ratio of first order gear pair 3,5.Gear 3 is arranged on axle 2, and gear 5,6 is arranged on axle 4, and gear 8 is arranged on axle 7
180 ° of the phase phase differences of 9,10, two cams 9,10 of at least two cams further, are installed on the afterbody transmission shaft 7 of described transmission system 37.The outer margin contour curvilinear function of cam 9, cam 10 is obtained according to analytic method, and parameters is all the same, and phase phase difference 180 ゜ are installed, and its relative position schematic diagram as shown in Figure 2.
Further, two flywheels 11,12 are installed on the afterbody transmission shaft 7 of described transmission system 37, flywheel 11,12 is arranged on the two ends of transmission shaft 7, makes system operation more steady, vibrates less.
Further, described actuator 38 comprises two plunger pumps 19,20, plunger pump 19,20 is connected in parallel, plunger pump 19,20 on pipeline, one-way valve is all installed, spring 17,18 is installed in plunger pump, plunger is provided with roller 13,14 on 15,16 terminations, and roller 13,14 is close on the cam 9,10 of driving mechanism under spring 17,18 effects.One-way valve 23,24 is arranged on feed liquor pipeline, and one-way valve 25,26 is arranged on fluid pipeline.Seal ring 21,22 is installed on plunger pump.
Plunger 15 is done straight line motion in plunger pump 19, and in a rise or backhaul, plunger 15 is first done the sinusoidal speedup motion of accelerating, after move with uniform velocity, finally do sinusoidal acceleration-deceleration motion.The characteristics of motion of plunger 16 in plunger pump 20 is identical with the characteristics of motion of plunger 15 in plunger pump 19, and still, any time, their moving direction is contrary.Such characteristics of motion, can guarantee that plunger moves with uniform velocity within the overwhelming majority time, can guarantee that again the acceleration of plunger does not produce sudden change, and the reaction force that cam is subject to does not produce sudden change, and system operation is more steady, longer service life.Fig. 3 is plunger 15 and the characteristics of motion schematic diagram of plunger 16 within a cycle of motion.
Described spring 17 and spring 18 adopt circular cross-section cylindroid helicalcoil compression spring.Spring 17 and spring 18 are always in compressive state, and the compressive force of spring is close to the external cylindrical surface of the roller on plunger and the outer margin contour surface of cam.
The liquid entering hole of described plunger pump 19 and plunger pump 20 and liquid port are at end face.Open loop connected in star above inboard wall of cylinder block.
Described seal ring 21 and seal ring 22 adopt dynamic seal ring, its objective is the gap between sealed plunger and cylinder body, prevent leakage.
It is 0 one-way valve that described one-way valve 23, one-way valve 24, one-way valve 25, one-way valve 26 all adopt cracking pressure.The effect of one-way valve 23 is to prevent from doing in the process of rise motion at plunger 15, and liquid flows back to container 28.The effect of one-way valve 24 is to prevent from doing in rise movement process at plunger 16, and liquid flows back to container 28.The effect of one-way valve 25 is to prevent from doing in the process of rise motion at plunger 16, and the liquid that the liquid port of plunger pump 20 is discharged flows in plunger pump 19.The effect of one-way valve 26 is to prevent from doing in the process of rise motion at plunger 15, and the liquid that the liquid port of plunger pump 19 is discharged flows in plunger pump 20.
Manually shut-off valve 27 is for controlling the open and close of container 28, and container 28 is for holding solution, and pipeline is used for connecting each hydraulic pressure components and parts, and the diameter of pipeline is without too macromutation.
Further, described control system 39 comprises flowmeter 29, pressure gauge 30, computer 32, pulse signal generator 33, ring distributor 34, analog line driver 35, flowmeter 29 and pressure gauge 30 are arranged on the fluid pipeline of actuator 38 and are connected with computer 32, computer 32 is connected with ring distributor 34, analog line driver 35 by pulse signal generator 33, control system 39 is for controlling whole device, by control impuls frequency, realize stepless change, by control impuls quantity, realize quantitative liquid-filling, by introducing flow feedback, improve fluid injection precision.
Further, on described computer 32, control software is installed, can carries out flow velocity setting, output liquid total amount is set, and safe-working pressure is set.
Preferably, described computer 32 adopts process control machine.The control software of topping-up pump is installed on process control machine, and user can carry out flow velocity setting by controlling software, and output liquid total amount is set, and safe-working pressure is set.Its interface as shown in Figure 4.
Further, described flowmeter 29 is instantaneous flowmeter, described pulse signal generator 33 is for generation of the pulse signal string of changeable frequency, described analog line driver 35 adopts unipolarity analog line driver, flowmeter 29 is for the online instantaneous flow that detects liquid outlet place, then data on flows is passed to computer.
Further, described ring distributor 34 is for distributing to pulse signal string each phase input end of the analog line driver of stepper motor by the desired rule of stepper motor.
Described pressure gauge 30 is for the online fluid pressure that detects outlet port.Pressure gauge 30 is selected capsule pressure gauge.
Further, on the fluid pipeline of described actuator 38, pressure switch 31 is installed, when the pressure at liquid outlet place lower than or during higher than setting pressure, the power supply that pressure switch 31 can automatic cut-off motors, stops operating motor.Pressure switch 31 is selected intelligent pressure switch, can realize the functions such as pressure measurement, demonstration, output, control.
Described analog line driver 35 is connected with each winding of stepper motor 1, and it can carry out power amplification by the output signal of ring distributor, obtain stepping and control the required impulsive current of winding and required pulse shape, then drive motor rotates.
Obviously, above mode of execution is only made for the present invention giving an example, and the not restriction to embodiment of the present invention.To those of ordinary skill in the art, can also make other changes in different forms on the basis of the above description.Here exhaustive without also giving all mode of executions.And these belong to apparent variation that spirit of the present invention amplified out or change still among protection scope of the present invention.
Claims (10)
1. the continuous topping-up pump of digital quantitative, it is characterized in that: comprise power source (36), transmission system (37), actuator (38), control system (39), described power source (36) output rotatablely moves, transmission system (37) is carried out speed change to rotatablely moving of power source (36) output, then be converted into straight line motion, and then drive actuator (38) by the liquid suction device in container (28), at liquid outlet, discharge, control system (39) is for controlling whole device again.
2. the continuous topping-up pump of digital quantitative according to claim 1, is characterized in that: described power source (36) is stepper motor (1).
3. the continuous topping-up pump of digital quantitative according to claim 1, it is characterized in that: described transmission system (37) is deceleration system, comprise two deceleration gear transmissions, the velocity ratio of second level gear pair (6,8) is greater than the velocity ratio of first order gear pair (3,5).
4. the continuous topping-up pump of digital quantitative according to claim 3, it is characterized in that: at least two cams (9,10) are installed, 180 ° of the phase phase differences of two cams (9,10) on the afterbody transmission shaft (7) of described transmission system (37).
5. the continuous topping-up pump of digital quantitative according to claim 1, it is characterized in that: two flywheels (11,12) are installed on the afterbody transmission shaft (7) of described transmission system (37), and flywheel (11,12) is arranged on the two ends of transmission shaft (7).
6. the continuous topping-up pump of digital quantitative according to claim 1, it is characterized in that: described actuator (38) comprises two plunger pumps (19,20), plunger pump (19,20) is connected in parallel, plunger pump (19,20) on pipeline, all have one-way valve, spring (17,18) is installed in plunger pump (19,20), plunger (15,16) is provided with roller (13,14) on termination, and roller (13,14) is close on the cam (9,10) of driving mechanism (37) under spring (17,18) effect.
7. the continuous topping-up pump of digital quantitative according to claim 1, it is characterized in that: described control system (39) comprises flowmeter (29), pressure gauge (30), computer (32), pulse signal generator (33), ring distributor (34), analog line driver (35), flowmeter (29) and pressure gauge (30) are arranged on the fluid pipeline of actuator (38) and are connected with computer (32), computer (32) is by pulse signal generator (33) and ring distributor (34), analog line driver (35) is connected, control system (39) is for controlling whole device, by control impuls frequency, realize stepless change, by control impuls quantity, realize quantitative liquid-filling, by introducing flow feedback, improve fluid injection precision, by introducing pressure switch, realize overload protection.
8. the continuous topping-up pump of digital quantitative according to claim 7, is characterized in that: described computer is provided with control software on (32), can carry out flow velocity setting, and output liquid total amount is set, and safe-working pressure is set.
9. the continuous topping-up pump of digital quantitative according to claim 7, it is characterized in that: described flowmeter (29) is instantaneous flowmeter, described pulse signal generator (33) is for generation of the pulse signal string of changeable frequency, and described analog line driver (35) adopts unipolarity analog line driver.
10. the continuous topping-up pump of digital quantitative according to claim 7, is characterized in that: described ring distributor (34) is for distributing to pulse signal string each phase input end of the analog line driver of stepper motor by the desired rule of stepper motor (1).
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| Application Number | Priority Date | Filing Date | Title |
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| CN201410253697.3A CN104033348B (en) | 2014-06-09 | 2014-06-09 | The continuous topping-up pump of digital quantitative |
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| CN201410253697.3A CN104033348B (en) | 2014-06-09 | 2014-06-09 | The continuous topping-up pump of digital quantitative |
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| CN104033348B CN104033348B (en) | 2016-09-21 |
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Cited By (5)
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| CN105429534A (en) * | 2015-12-15 | 2016-03-23 | 苏州长光华医生物医学工程有限公司 | High-accuracy liquid injection control system and method |
| CN105467142A (en) * | 2015-11-20 | 2016-04-06 | 广东伟创科技开发有限公司 | Industrial injection pump |
| CN108916165A (en) * | 2018-07-20 | 2018-11-30 | 张志成 | Double-generator, which is avoided the peak hour, is superimposed the pulse digital flow method of output |
| CN110030172A (en) * | 2019-05-21 | 2019-07-19 | 菲立化学工程(遂昌)有限公司 | It is a kind of can accurate measurement more pump head constant flow pump automated systems |
| CN114962229A (en) * | 2021-08-20 | 2022-08-30 | 保定雷弗流体科技有限公司 | Flow control method and device for peristaltic pump |
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